Upendra, with respect to the error installing timingwheel, msg268983, that looks like a bug in timingwheel.  Report it to the pip or timingwheel list or tracker.  I ran the command normally and got the same exception, with less noise.  It is not a problem with using main.

C:\Programs\Python36>python -m pip install -U timingwheel
Collecting timingwheel
  Downloading timingwheel-0.4.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "C:\Users\Terry\AppData\Local\Temp\pip-build-ypf8yppj\timingwheel\setup.py", line 3, in <module>
        from timingwheel import version
      File "C:\Users\Terry\AppData\Local\Temp\pip-build-ypf8yppj\timingwheel\timingwheel\__init__.py", line 1, in <module>
        from timingwheel import BaseWheel, TimingWheel
    ImportError: cannot import name 'BaseWheel'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in C:\Users\Terry\AppData\Local\Temp\pip-build-ypf8yppj\timingwheel\